Centrifugal pump hMAX

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Overview
Air locking reduces pump efficiency and availability in froth and high-air slurry duties. KREBS® hMAX, vMAX™ and slurryMAX™ pumps are engineered to pass entrained air while maintaining duty flow and head, offering reliable operation in heavy-duty froth pumping and abrasive slurry services.

Key benefits

• Reduce air locking: hMAX recessed-impeller and other KREBS® froth designs allow entrained air to pass without significant loss of duty flow or head, reducing efficiency loss and the operational impact of air locking.
• Optimise wear performance: Multiple liner and material options (elastomers, polyurethane, high-chrome alloys) enable selection for abrasive or corrosive slurries and deliver predictable, even wear for planned maintenance.
• Easier inspection and maintenance: From 8x6 in. (200x150 mm), slurryMAX pumps feature a removable suction liner assembly allowing internal inspection and impeller replacement without removing discharge piping.

Models and typical applications

• hMAX slurry pumps — Horizontal recessed-impeller design for high froth-factor applications (>4). Features include a recessed impeller to pass entrained air, optional concentric casing to reduce radial loads, and extended wear life for flotation duties.
• slurryMAX slurry pumps — Split-case horizontal slurry pumps for abrasive slurries (mining, aggregates). Provide even, predictable wear life and interchangeable material options for liners, impellers and wear rings.
• slurryMAX-XD slurry pumps — Heavy-duty horizontal variant with steel-reinforced elastomer linings and heavy-duty impeller for the most aggressive duties (primary cyclone feed, regrind, tailings).
• vMAX vertical slurry pumps — Optimised hydraulics for large solids and viscous fluids; bottom-only suction prevents clogging and suits sump duties; available in-tank or on-skid.
• vMAX-R vertical slurry pumps — Rubber-lined vMAX for corrosive slurries and finer solids, with multiple material options for acidic or elevated-temperature services.

Add-ons and accessories

• KREBS® belt tensioning system — enables rapid V-belt changes without pulley realignment.
• KREBS® Quick Release™ system — reduces wear-parts replacement time (often by 50%+) and improves safety during maintenance.
• KREBS® Smart Pumps app — real-time monitoring, operational optimisation and instant alerts to support performance and maintenance planning.

Maintenance & service
Global service and spare-parts network provides timely access to wear parts, fast offsite rebuilds and experienced field service engineers. Services include performance monitoring, upgrade recommendations, operational-practice improvements and operation & maintenance training to preserve pump best-efficiency over the installation lifetime.

Technical specifications

• Brand: KREBS® (FLSmidth)
• Suitable for frothy slurries with high air entrainment (froth factor >4 for hMAX applications)
• hMAX: horizontal recessed-impeller design to pass entrained air and reduce air locking
• Concentric casing option to reduce radial loads (selected models)
• slurryMAX / slurryMAX-XD: split-case horizontal designs with interchangeable liner/material options; slurryMAX-XD includes steel-reinforced elastomer linings and heavy-duty impeller
• vMAX / vMAX-R: vertical cantilever designs for large solids, viscous fluids and sump duties; vMAX-R offers rubber-lined option for corrosive/fine solids applications
• Liner materials: elastomers, polyurethane, high-chrome alloys (selected per application to optimise wear life)
• Maintenance features: removable suction liner assembly for internal inspection and impeller replacement without removing discharge piping (from 8x6 in. / 200x150 mm sizes)
• Applications: flotation circuit froth pumping, cyclone feeds, regrind, tailings, sump duties and other heavy-duty slurry services